The modern battle royale gamemode was developed by playerunknown in his arma 3 mod released in 2014, after which he went on to develope h1z1: king of the hill and finally PUGB so it's fair to say he's the father of the genre but like like dndxplain noted in >>#25 the games similarity is not the issue with the lawsuit

that isn't what's happenin' though, between PUBG and Fortnite. they're not suing because of similar game premises but because Fortnite Officials have been namechecking PUBG in advertisements and interviews without permission

It's apparently not about claiming a copyright infringement regarding the IP of Battle Royale, but rather about Epic Games' licence for the Unreal Engine. PUBG seems to modify the UE for their own purposes and they're afraid EG will use these changes for their own game despite them paying royalties to EG for using their engine. But I guess that should be solvable by looking at their licencing contract.
I'm not quite sure if this is a reasonable argument, but given that Bluehole hasn't yet claimed other copyright infringements from other companies, I'd say that it at least isn't about the IP of a last man standing gamemode in general.

Not to mention Battlegrounds is basically a carbon copy of H1Z1 Battle Royale and H1Z1 Battle Royale is basically a carbon copy of ARMA 3 Battle Royale. They all improve on eachother a little bit, in general, and Fortnite added its own unique mechanics to the mix. I don't see how anyone could be mad at that.

Gross missrepresentation. The suing isn't about mechanics.
I might have missed some points, but AFAIK, the gist is this:
>be PUBGdev, see other companies build lots of other battle-royale style games, the most obvious copy being R* making a mode for GTA5, and ignore it.
>ask Epic for help on special features for game engine, for example ability to have 100 players on same server.
>Epic sees work that they already did and say "we can make our own thing with this"
>PUBGdev says, "hey, that's not fair, you're using work that was done for us, for your own, competing product"
>**** goes down